sif: query_device: Return correct #SGEs for EoIB

sif: query_device: Return correct #SGEs for EoIB

ULPs that use LSO, can only create QPs with #SGE entries being one
less than what is supported in HW. This because PSIF uses one entry
for the LSO stencil. The driver attempts to detect the ULP and from
that derive if LSO will be used.

This commit adds support for XVE (Xsigo Virtual Ethernet), and a
query_device() from the XVE driver (not the connected mode part), will
return one less #SGEs.

Further, since the XVE ULP is detected, we amend the sysfs listing of
QPs with EoIB (for XVE datagram mode QPs) and EoIB_CM (for XVE
connected mode QPs).

Orabug: 25027106

Signed-off-by: Hakon Bugge <Haakon.Bugge@oracle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>